Add SweepGradientBrush & SweepGradientPaint

[eth-ellis]

Description

It would be great if .NET MAUI implemented sweep gradients for controls and drawables.

Public API Changes

The addition of:

• SweepGradientBrush to Microsoft.Maui.Controls
• SweepGradientPaint to Microsoft.Maui.Graphics

Intended Use-Case

An intended use case would be to create a radial gauge with a gradient using MAUI graphics.

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[eth-ellis]

Looked into implementing sweep gradients and found that they are supported natively on Android, iOS and macOS but not Windows from what I can tell.

Android - Sweep Gradient
iOS and macOS - Conic Gradient

I was able to get a prototype working on Android:

I also realised that to implement the intended use case Microsoft.Maui.Graphics would need to support applying paints to DrawCircle, DrawArc etc. rather than just FillCircle, FillArc etc.

If StrokeLineCap Round, Paint and DrawArc could all be used together the intended use case could be achieved quite simply.